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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef ISCSI_TARGET_CORE_H
3#define ISCSI_TARGET_CORE_H
4
5#include <linux/dma-direction.h> /* enum dma_data_direction */
6#include <linux/list.h> /* struct list_head */
7#include <linux/sched.h>
8#include <linux/socket.h> /* struct sockaddr_storage */
9#include <linux/types.h> /* u8 */
10#include <scsi/iscsi_proto.h> /* itt_t */
11#include <target/target_core_base.h> /* struct se_cmd */
12
13struct sock;
14
15#define ISCSIT_VERSION "v4.1.0"
16#define ISCSI_MAX_DATASN_MISSING_COUNT 16
17#define ISCSI_TX_THREAD_TCP_TIMEOUT 2
18#define ISCSI_RX_THREAD_TCP_TIMEOUT 2
19#define SECONDS_FOR_ASYNC_LOGOUT 10
20#define SECONDS_FOR_ASYNC_TEXT 10
21#define SECONDS_FOR_LOGOUT_COMP 15
22#define WHITE_SPACE " \t\v\f\n\r"
23#define ISCSIT_MIN_TAGS 16
24#define ISCSIT_EXTRA_TAGS 8
25#define ISCSIT_TCP_BACKLOG 256
26#define ISCSI_RX_THREAD_NAME "iscsi_trx"
27#define ISCSI_TX_THREAD_NAME "iscsi_ttx"
28#define ISCSI_IQN_LEN 224
29
30/* struct iscsi_node_attrib sanity values */
31#define NA_DATAOUT_TIMEOUT 3
32#define NA_DATAOUT_TIMEOUT_MAX 60
33#define NA_DATAOUT_TIMEOUT_MIX 2
34#define NA_DATAOUT_TIMEOUT_RETRIES 5
35#define NA_DATAOUT_TIMEOUT_RETRIES_MAX 15
36#define NA_DATAOUT_TIMEOUT_RETRIES_MIN 1
37#define NA_NOPIN_TIMEOUT 15
38#define NA_NOPIN_TIMEOUT_MAX 60
39#define NA_NOPIN_TIMEOUT_MIN 3
40#define NA_NOPIN_RESPONSE_TIMEOUT 30
41#define NA_NOPIN_RESPONSE_TIMEOUT_MAX 60
42#define NA_NOPIN_RESPONSE_TIMEOUT_MIN 3
43#define NA_RANDOM_DATAIN_PDU_OFFSETS 0
44#define NA_RANDOM_DATAIN_SEQ_OFFSETS 0
45#define NA_RANDOM_R2T_OFFSETS 0
46
47/* struct iscsi_tpg_attrib sanity values */
48#define TA_AUTHENTICATION 1
49#define TA_LOGIN_TIMEOUT 15
50#define TA_LOGIN_TIMEOUT_MAX 30
51#define TA_LOGIN_TIMEOUT_MIN 5
52#define TA_NETIF_TIMEOUT 2
53#define TA_NETIF_TIMEOUT_MAX 15
54#define TA_NETIF_TIMEOUT_MIN 2
55#define TA_GENERATE_NODE_ACLS 0
56#define TA_DEFAULT_CMDSN_DEPTH 64
57#define TA_DEFAULT_CMDSN_DEPTH_MAX 512
58#define TA_DEFAULT_CMDSN_DEPTH_MIN 1
59#define TA_CACHE_DYNAMIC_ACLS 0
60/* Enabled by default in demo mode (generic_node_acls=1) */
61#define TA_DEMO_MODE_WRITE_PROTECT 1
62/* Disabled by default in production mode w/ explict ACLs */
63#define TA_PROD_MODE_WRITE_PROTECT 0
64#define TA_DEMO_MODE_DISCOVERY 1
65#define TA_DEFAULT_ERL 0
66#define TA_CACHE_CORE_NPS 0
67/* T10 protection information disabled by default */
68#define TA_DEFAULT_T10_PI 0
69#define TA_DEFAULT_FABRIC_PROT_TYPE 0
70/* TPG status needs to be enabled to return sendtargets discovery endpoint info */
71#define TA_DEFAULT_TPG_ENABLED_SENDTARGETS 1
72/*
73 * Used to control the sending of keys with optional to respond state bit,
74 * as a workaround for non RFC compliant initiators,that do not propose,
75 * nor respond to specific keys required for login to complete.
76 *
77 * See iscsi_check_proposer_for_optional_reply() for more details.
78 */
79#define TA_DEFAULT_LOGIN_KEYS_WORKAROUND 1
80
81#define ISCSI_IOV_DATA_BUFFER 5
82
83enum iscsit_transport_type {
84 ISCSI_TCP = 0,
85 ISCSI_SCTP_TCP = 1,
86 ISCSI_SCTP_UDP = 2,
87 ISCSI_IWARP_TCP = 3,
88 ISCSI_IWARP_SCTP = 4,
89 ISCSI_INFINIBAND = 5,
90 ISCSI_CXGBIT = 6,
91};
92
93/* RFC-3720 7.1.4 Standard Connection State Diagram for a Target */
94enum target_conn_state_table {
95 TARG_CONN_STATE_FREE = 0x1,
96 TARG_CONN_STATE_XPT_UP = 0x3,
97 TARG_CONN_STATE_IN_LOGIN = 0x4,
98 TARG_CONN_STATE_LOGGED_IN = 0x5,
99 TARG_CONN_STATE_IN_LOGOUT = 0x6,
100 TARG_CONN_STATE_LOGOUT_REQUESTED = 0x7,
101 TARG_CONN_STATE_CLEANUP_WAIT = 0x8,
102};
103
104/* RFC-3720 7.3.2 Session State Diagram for a Target */
105enum target_sess_state_table {
106 TARG_SESS_STATE_FREE = 0x1,
107 TARG_SESS_STATE_ACTIVE = 0x2,
108 TARG_SESS_STATE_LOGGED_IN = 0x3,
109 TARG_SESS_STATE_FAILED = 0x4,
110 TARG_SESS_STATE_IN_CONTINUE = 0x5,
111};
112
113/* struct iscsi_data_count->type */
114enum data_count_type {
115 ISCSI_RX_DATA = 1,
116 ISCSI_TX_DATA = 2,
117};
118
119/* struct iscsi_datain_req->dr_complete */
120enum datain_req_comp_table {
121 DATAIN_COMPLETE_NORMAL = 1,
122 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY = 2,
123 DATAIN_COMPLETE_CONNECTION_RECOVERY = 3,
124};
125
126/* struct iscsi_datain_req->recovery */
127enum datain_req_rec_table {
128 DATAIN_WITHIN_COMMAND_RECOVERY = 1,
129 DATAIN_CONNECTION_RECOVERY = 2,
130};
131
132/* struct iscsi_portal_group->state */
133enum tpg_state_table {
134 TPG_STATE_FREE = 0,
135 TPG_STATE_ACTIVE = 1,
136 TPG_STATE_INACTIVE = 2,
137 TPG_STATE_COLD_RESET = 3,
138};
139
140/* struct iscsi_tiqn->tiqn_state */
141enum tiqn_state_table {
142 TIQN_STATE_ACTIVE = 1,
143 TIQN_STATE_SHUTDOWN = 2,
144};
145
146/* struct iscsi_cmd->cmd_flags */
147enum cmd_flags_table {
148 ICF_GOT_LAST_DATAOUT = 0x00000001,
149 ICF_GOT_DATACK_SNACK = 0x00000002,
150 ICF_NON_IMMEDIATE_UNSOLICITED_DATA = 0x00000004,
151 ICF_SENT_LAST_R2T = 0x00000008,
152 ICF_WITHIN_COMMAND_RECOVERY = 0x00000010,
153 ICF_CONTIG_MEMORY = 0x00000020,
154 ICF_ATTACHED_TO_RQUEUE = 0x00000040,
155 ICF_OOO_CMDSN = 0x00000080,
156 ICF_SENDTARGETS_ALL = 0x00000100,
157 ICF_SENDTARGETS_SINGLE = 0x00000200,
158};
159
160/* struct iscsi_cmd->i_state */
161enum cmd_i_state_table {
162 ISTATE_NO_STATE = 0,
163 ISTATE_NEW_CMD = 1,
164 ISTATE_DEFERRED_CMD = 2,
165 ISTATE_UNSOLICITED_DATA = 3,
166 ISTATE_RECEIVE_DATAOUT = 4,
167 ISTATE_RECEIVE_DATAOUT_RECOVERY = 5,
168 ISTATE_RECEIVED_LAST_DATAOUT = 6,
169 ISTATE_WITHIN_DATAOUT_RECOVERY = 7,
170 ISTATE_IN_CONNECTION_RECOVERY = 8,
171 ISTATE_RECEIVED_TASKMGT = 9,
172 ISTATE_SEND_ASYNCMSG = 10,
173 ISTATE_SENT_ASYNCMSG = 11,
174 ISTATE_SEND_DATAIN = 12,
175 ISTATE_SEND_LAST_DATAIN = 13,
176 ISTATE_SENT_LAST_DATAIN = 14,
177 ISTATE_SEND_LOGOUTRSP = 15,
178 ISTATE_SENT_LOGOUTRSP = 16,
179 ISTATE_SEND_NOPIN = 17,
180 ISTATE_SENT_NOPIN = 18,
181 ISTATE_SEND_REJECT = 19,
182 ISTATE_SENT_REJECT = 20,
183 ISTATE_SEND_R2T = 21,
184 ISTATE_SENT_R2T = 22,
185 ISTATE_SEND_R2T_RECOVERY = 23,
186 ISTATE_SENT_R2T_RECOVERY = 24,
187 ISTATE_SEND_LAST_R2T = 25,
188 ISTATE_SENT_LAST_R2T = 26,
189 ISTATE_SEND_LAST_R2T_RECOVERY = 27,
190 ISTATE_SENT_LAST_R2T_RECOVERY = 28,
191 ISTATE_SEND_STATUS = 29,
192 ISTATE_SEND_STATUS_BROKEN_PC = 30,
193 ISTATE_SENT_STATUS = 31,
194 ISTATE_SEND_STATUS_RECOVERY = 32,
195 ISTATE_SENT_STATUS_RECOVERY = 33,
196 ISTATE_SEND_TASKMGTRSP = 34,
197 ISTATE_SENT_TASKMGTRSP = 35,
198 ISTATE_SEND_TEXTRSP = 36,
199 ISTATE_SENT_TEXTRSP = 37,
200 ISTATE_SEND_NOPIN_WANT_RESPONSE = 38,
201 ISTATE_SENT_NOPIN_WANT_RESPONSE = 39,
202 ISTATE_SEND_NOPIN_NO_RESPONSE = 40,
203 ISTATE_REMOVE = 41,
204 ISTATE_FREE = 42,
205};
206
207/* Used for iscsi_recover_cmdsn() return values */
208enum recover_cmdsn_ret_table {
209 CMDSN_ERROR_CANNOT_RECOVER = -1,
210 CMDSN_NORMAL_OPERATION = 0,
211 CMDSN_LOWER_THAN_EXP = 1,
212 CMDSN_HIGHER_THAN_EXP = 2,
213 CMDSN_MAXCMDSN_OVERRUN = 3,
214};
215
216/* Used for iscsi_handle_immediate_data() return values */
217enum immedate_data_ret_table {
218 IMMEDIATE_DATA_CANNOT_RECOVER = -1,
219 IMMEDIATE_DATA_NORMAL_OPERATION = 0,
220 IMMEDIATE_DATA_ERL1_CRC_FAILURE = 1,
221};
222
223/* Used for iscsi_decide_dataout_action() return values */
224enum dataout_action_ret_table {
225 DATAOUT_CANNOT_RECOVER = -1,
226 DATAOUT_NORMAL = 0,
227 DATAOUT_SEND_R2T = 1,
228 DATAOUT_SEND_TO_TRANSPORT = 2,
229 DATAOUT_WITHIN_COMMAND_RECOVERY = 3,
230};
231
232/* Used for struct iscsi_node_auth->naf_flags */
233enum naf_flags_table {
234 NAF_USERID_SET = 0x01,
235 NAF_PASSWORD_SET = 0x02,
236 NAF_USERID_IN_SET = 0x04,
237 NAF_PASSWORD_IN_SET = 0x08,
238};
239
240/* Used by various struct timer_list to manage iSCSI specific state */
241enum iscsi_timer_flags_table {
242 ISCSI_TF_RUNNING = 0x01,
243 ISCSI_TF_STOP = 0x02,
244 ISCSI_TF_EXPIRED = 0x04,
245};
246
247/* Used for struct iscsi_np->np_flags */
248enum np_flags_table {
249 NPF_IP_NETWORK = 0x00,
250};
251
252/* Used for struct iscsi_np->np_thread_state */
253enum np_thread_state_table {
254 ISCSI_NP_THREAD_ACTIVE = 1,
255 ISCSI_NP_THREAD_INACTIVE = 2,
256 ISCSI_NP_THREAD_RESET = 3,
257 ISCSI_NP_THREAD_SHUTDOWN = 4,
258 ISCSI_NP_THREAD_EXIT = 5,
259};
260
261struct iscsi_conn_ops {
262 u8 HeaderDigest; /* [0,1] == [None,CRC32C] */
263 u8 DataDigest; /* [0,1] == [None,CRC32C] */
264 u32 MaxRecvDataSegmentLength; /* [512..2**24-1] */
265 u32 MaxXmitDataSegmentLength; /* [512..2**24-1] */
266 /*
267 * iSER specific connection parameters
268 */
269 u32 InitiatorRecvDataSegmentLength; /* [512..2**24-1] */
270 u32 TargetRecvDataSegmentLength; /* [512..2**24-1] */
271};
272
273struct iscsi_sess_ops {
274 char InitiatorName[ISCSI_IQN_LEN];
275 char InitiatorAlias[256];
276 char TargetName[ISCSI_IQN_LEN];
277 char TargetAlias[256];
278 char TargetAddress[256];
279 u16 TargetPortalGroupTag; /* [0..65535] */
280 u16 MaxConnections; /* [1..65535] */
281 u8 InitialR2T; /* [0,1] == [No,Yes] */
282 u8 ImmediateData; /* [0,1] == [No,Yes] */
283 u32 MaxBurstLength; /* [512..2**24-1] */
284 u32 FirstBurstLength; /* [512..2**24-1] */
285 u16 DefaultTime2Wait; /* [0..3600] */
286 u16 DefaultTime2Retain; /* [0..3600] */
287 u16 MaxOutstandingR2T; /* [1..65535] */
288 u8 DataPDUInOrder; /* [0,1] == [No,Yes] */
289 u8 DataSequenceInOrder; /* [0,1] == [No,Yes] */
290 u8 ErrorRecoveryLevel; /* [0..2] */
291 u8 SessionType; /* [0,1] == [Normal,Discovery]*/
292 /*
293 * iSER specific session parameters
294 */
295 u8 RDMAExtensions; /* [0,1] == [No,Yes] */
296};
297
298struct iscsi_queue_req {
299 int state;
300 struct iscsi_cmd *cmd;
301 struct list_head qr_list;
302};
303
304struct iscsi_data_count {
305 int data_length;
306 int sync_and_steering;
307 enum data_count_type type;
308 u32 iov_count;
309 u32 ss_iov_count;
310 u32 ss_marker_count;
311 struct kvec *iov;
312};
313
314struct iscsi_param_list {
315 bool iser;
316 struct list_head param_list;
317 struct list_head extra_response_list;
318};
319
320struct iscsi_datain_req {
321 enum datain_req_comp_table dr_complete;
322 int generate_recovery_values;
323 enum datain_req_rec_table recovery;
324 u32 begrun;
325 u32 runlength;
326 u32 data_length;
327 u32 data_offset;
328 u32 data_sn;
329 u32 next_burst_len;
330 u32 read_data_done;
331 u32 seq_send_order;
332 struct list_head cmd_datain_node;
333} ____cacheline_aligned;
334
335struct iscsi_ooo_cmdsn {
336 u16 cid;
337 u32 batch_count;
338 u32 cmdsn;
339 u32 exp_cmdsn;
340 struct iscsi_cmd *cmd;
341 struct list_head ooo_list;
342} ____cacheline_aligned;
343
344struct iscsi_datain {
345 u8 flags;
346 u32 data_sn;
347 u32 length;
348 u32 offset;
349} ____cacheline_aligned;
350
351struct iscsi_r2t {
352 int seq_complete;
353 int recovery_r2t;
354 int sent_r2t;
355 u32 r2t_sn;
356 u32 offset;
357 u32 targ_xfer_tag;
358 u32 xfer_len;
359 struct list_head r2t_list;
360} ____cacheline_aligned;
361
362struct iscsi_cmd {
363 enum iscsi_timer_flags_table dataout_timer_flags;
364 /* DataOUT timeout retries */
365 u8 dataout_timeout_retries;
366 /* Within command recovery count */
367 u8 error_recovery_count;
368 /* iSCSI dependent state for out or order CmdSNs */
369 enum cmd_i_state_table deferred_i_state;
370 /* iSCSI dependent state */
371 enum cmd_i_state_table i_state;
372 /* Command is an immediate command (ISCSI_OP_IMMEDIATE set) */
373 u8 immediate_cmd;
374 /* Immediate data present */
375 u8 immediate_data;
376 /* iSCSI Opcode */
377 u8 iscsi_opcode;
378 /* iSCSI Response Code */
379 u8 iscsi_response;
380 /* Logout reason when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
381 u8 logout_reason;
382 /* Logout response code when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
383 u8 logout_response;
384 /* MaxCmdSN has been incremented */
385 u8 maxcmdsn_inc;
386 /* Immediate Unsolicited Dataout */
387 u8 unsolicited_data;
388 /* Reject reason code */
389 u8 reject_reason;
390 /* CID contained in logout PDU when opcode == ISCSI_INIT_LOGOUT_CMND */
391 u16 logout_cid;
392 /* Command flags */
393 enum cmd_flags_table cmd_flags;
394 /* Initiator Task Tag assigned from Initiator */
395 itt_t init_task_tag;
396 /* Target Transfer Tag assigned from Target */
397 u32 targ_xfer_tag;
398 /* CmdSN assigned from Initiator */
399 u32 cmd_sn;
400 /* ExpStatSN assigned from Initiator */
401 u32 exp_stat_sn;
402 /* StatSN assigned to this ITT */
403 u32 stat_sn;
404 /* DataSN Counter */
405 u32 data_sn;
406 /* R2TSN Counter */
407 u32 r2t_sn;
408 /* Last DataSN acknowledged via DataAck SNACK */
409 u32 acked_data_sn;
410 /* Used for echoing NOPOUT ping data */
411 u32 buf_ptr_size;
412 /* Used to store DataDigest */
413 u32 data_crc;
414 /* Counter for MaxOutstandingR2T */
415 u32 outstanding_r2ts;
416 /* Next R2T Offset when DataSequenceInOrder=Yes */
417 u32 r2t_offset;
418 /* Iovec current and orig count for iscsi_cmd->iov_data */
419 u32 iov_data_count;
420 u32 orig_iov_data_count;
421 /* Number of miscellaneous iovecs used for IP stack calls */
422 u32 iov_misc_count;
423 /* Number of struct iscsi_pdu in struct iscsi_cmd->pdu_list */
424 u32 pdu_count;
425 /* Next struct iscsi_pdu to send in struct iscsi_cmd->pdu_list */
426 u32 pdu_send_order;
427 /* Current struct iscsi_pdu in struct iscsi_cmd->pdu_list */
428 u32 pdu_start;
429 /* Next struct iscsi_seq to send in struct iscsi_cmd->seq_list */
430 u32 seq_send_order;
431 /* Number of struct iscsi_seq in struct iscsi_cmd->seq_list */
432 u32 seq_count;
433 /* Current struct iscsi_seq in struct iscsi_cmd->seq_list */
434 u32 seq_no;
435 /* Lowest offset in current DataOUT sequence */
436 u32 seq_start_offset;
437 /* Highest offset in current DataOUT sequence */
438 u32 seq_end_offset;
439 /* Total size in bytes received so far of READ data */
440 u32 read_data_done;
441 /* Total size in bytes received so far of WRITE data */
442 u32 write_data_done;
443 /* Counter for FirstBurstLength key */
444 u32 first_burst_len;
445 /* Counter for MaxBurstLength key */
446 u32 next_burst_len;
447 /* Transfer size used for IP stack calls */
448 u32 tx_size;
449 /* Buffer used for various purposes */
450 void *buf_ptr;
451 /* Used by SendTargets=[iqn.,eui.] discovery */
452 void *text_in_ptr;
453 /* See include/linux/dma-mapping.h */
454 enum dma_data_direction data_direction;
455 /* iSCSI PDU Header + CRC */
456 unsigned char pdu[ISCSI_HDR_LEN + ISCSI_CRC_LEN];
457 /* Number of times struct iscsi_cmd is present in immediate queue */
458 atomic_t immed_queue_count;
459 atomic_t response_queue_count;
460 spinlock_t datain_lock;
461 spinlock_t dataout_timeout_lock;
462 /* spinlock for protecting struct iscsi_cmd->i_state */
463 spinlock_t istate_lock;
464 /* spinlock for adding within command recovery entries */
465 spinlock_t error_lock;
466 /* spinlock for adding R2Ts */
467 spinlock_t r2t_lock;
468 /* DataIN List */
469 struct list_head datain_list;
470 /* R2T List */
471 struct list_head cmd_r2t_list;
472 /* Timer for DataOUT */
473 struct timer_list dataout_timer;
474 /* Iovecs for SCSI data payload RX/TX w/ kernel level sockets */
475 struct kvec *iov_data;
476 void *overflow_buf;
477 /* Iovecs for miscellaneous purposes */
478#define ISCSI_MISC_IOVECS 5
479 struct kvec iov_misc[ISCSI_MISC_IOVECS];
480 /* Array of struct iscsi_pdu used for DataPDUInOrder=No */
481 struct iscsi_pdu *pdu_list;
482 /* Current struct iscsi_pdu used for DataPDUInOrder=No */
483 struct iscsi_pdu *pdu_ptr;
484 /* Array of struct iscsi_seq used for DataSequenceInOrder=No */
485 struct iscsi_seq *seq_list;
486 /* Current struct iscsi_seq used for DataSequenceInOrder=No */
487 struct iscsi_seq *seq_ptr;
488 /* TMR Request when iscsi_opcode == ISCSI_OP_SCSI_TMFUNC */
489 struct iscsi_tmr_req *tmr_req;
490 /* Connection this command is alligient to */
491 struct iscsi_conn *conn;
492 /* Pointer to connection recovery entry */
493 struct iscsi_conn_recovery *cr;
494 /* Session the command is part of, used for connection recovery */
495 struct iscsi_session *sess;
496 /* list_head for connection list */
497 struct list_head i_conn_node;
498 /* The TCM I/O descriptor that is accessed via container_of() */
499 struct se_cmd se_cmd;
500 /* Sense buffer that will be mapped into outgoing status */
501#define ISCSI_SENSE_BUFFER_LEN (TRANSPORT_SENSE_BUFFER + 2)
502 unsigned char sense_buffer[ISCSI_SENSE_BUFFER_LEN];
503
504 u32 padding;
505 u8 pad_bytes[4];
506
507 struct scatterlist *first_data_sg;
508 u32 first_data_sg_off;
509 u32 kmapped_nents;
510 sense_reason_t sense_reason;
511} ____cacheline_aligned;
512
513struct iscsi_tmr_req {
514 bool task_reassign:1;
515 u32 exp_data_sn;
516 struct iscsi_cmd *ref_cmd;
517 struct iscsi_conn_recovery *conn_recovery;
518 struct se_tmr_req *se_tmr_req;
519};
520
521struct iscsi_conn {
522 wait_queue_head_t queues_wq;
523 /* Authentication Successful for this connection */
524 u8 auth_complete;
525 /* State connection is currently in */
526 u8 conn_state;
527 u8 conn_logout_reason;
528 u8 network_transport;
529 enum iscsi_timer_flags_table nopin_timer_flags;
530 enum iscsi_timer_flags_table nopin_response_timer_flags;
531 /* Used to know what thread encountered a transport failure */
532 u8 which_thread;
533 /* connection id assigned by the Initiator */
534 u16 cid;
535 /* Remote TCP Port */
536 u16 login_port;
537 int net_size;
538 int login_family;
539 u32 auth_id;
540 u32 conn_flags;
541 /* Used for iscsi_tx_login_rsp() */
542 itt_t login_itt;
543 u32 exp_statsn;
544 /* Per connection status sequence number */
545 u32 stat_sn;
546 struct sockaddr_storage login_sockaddr;
547 struct sockaddr_storage local_sockaddr;
548 int conn_usage_count;
549 int conn_waiting_on_uc;
550 atomic_t check_immediate_queue;
551 atomic_t conn_logout_remove;
552 atomic_t connection_exit;
553 atomic_t connection_recovery;
554 atomic_t connection_reinstatement;
555 atomic_t connection_wait_rcfr;
556 atomic_t sleep_on_conn_wait_comp;
557 atomic_t transport_failed;
558 struct completion conn_post_wait_comp;
559 struct completion conn_wait_comp;
560 struct completion conn_wait_rcfr_comp;
561 struct completion conn_waiting_on_uc_comp;
562 struct completion conn_logout_comp;
563 struct completion tx_half_close_comp;
564 struct completion rx_half_close_comp;
565 /* socket used by this connection */
566 struct socket *sock;
567 void (*orig_data_ready)(struct sock *);
568 void (*orig_state_change)(struct sock *);
569#define LOGIN_FLAGS_READ_ACTIVE 1
570#define LOGIN_FLAGS_CLOSED 2
571#define LOGIN_FLAGS_READY 4
572#define LOGIN_FLAGS_INITIAL_PDU 8
573 unsigned long login_flags;
574 struct delayed_work login_work;
575 struct iscsi_login *login;
576 struct timer_list nopin_timer;
577 struct timer_list nopin_response_timer;
578 struct timer_list transport_timer;
579 struct task_struct *login_kworker;
580 /* Spinlock used for add/deleting cmd's from conn_cmd_list */
581 spinlock_t cmd_lock;
582 spinlock_t conn_usage_lock;
583 spinlock_t immed_queue_lock;
584 spinlock_t nopin_timer_lock;
585 spinlock_t response_queue_lock;
586 spinlock_t state_lock;
587 /* libcrypto RX and TX contexts for crc32c */
588 struct ahash_request *conn_rx_hash;
589 struct ahash_request *conn_tx_hash;
590 /* Used for scheduling TX and RX connection kthreads */
591 cpumask_var_t conn_cpumask;
592 unsigned int conn_rx_reset_cpumask:1;
593 unsigned int conn_tx_reset_cpumask:1;
594 /* list_head of struct iscsi_cmd for this connection */
595 struct list_head conn_cmd_list;
596 struct list_head immed_queue_list;
597 struct list_head response_queue_list;
598 struct iscsi_conn_ops *conn_ops;
599 struct iscsi_login *conn_login;
600 struct iscsit_transport *conn_transport;
601 struct iscsi_param_list *param_list;
602 /* Used for per connection auth state machine */
603 void *auth_protocol;
604 void *context;
605 struct iscsi_login_thread_s *login_thread;
606 struct iscsi_portal_group *tpg;
607 struct iscsi_tpg_np *tpg_np;
608 /* Pointer to parent session */
609 struct iscsi_session *sess;
610 int bitmap_id;
611 int rx_thread_active;
612 struct task_struct *rx_thread;
613 struct completion rx_login_comp;
614 int tx_thread_active;
615 struct task_struct *tx_thread;
616 /* list_head for session connection list */
617 struct list_head conn_list;
618} ____cacheline_aligned;
619
620struct iscsi_conn_recovery {
621 u16 cid;
622 u32 cmd_count;
623 u32 maxrecvdatasegmentlength;
624 u32 maxxmitdatasegmentlength;
625 int ready_for_reallegiance;
626 struct list_head conn_recovery_cmd_list;
627 spinlock_t conn_recovery_cmd_lock;
628 struct timer_list time2retain_timer;
629 struct iscsi_session *sess;
630 struct list_head cr_list;
631} ____cacheline_aligned;
632
633struct iscsi_session {
634 u8 initiator_vendor;
635 u8 isid[6];
636 enum iscsi_timer_flags_table time2retain_timer_flags;
637 u8 version_active;
638 u16 cid_called;
639 u16 conn_recovery_count;
640 u16 tsih;
641 /* state session is currently in */
642 u32 session_state;
643 /* session wide counter: initiator assigned task tag */
644 itt_t init_task_tag;
645 /* session wide counter: target assigned task tag */
646 u32 targ_xfer_tag;
647 u32 cmdsn_window;
648
649 /* protects cmdsn values */
650 struct mutex cmdsn_mutex;
651 /* session wide counter: expected command sequence number */
652 u32 exp_cmd_sn;
653 /* session wide counter: maximum allowed command sequence number */
654 atomic_t max_cmd_sn;
655 struct list_head sess_ooo_cmdsn_list;
656
657 /* LIO specific session ID */
658 u32 sid;
659 char auth_type[8];
660 /* unique within the target */
661 int session_index;
662 /* Used for session reference counting */
663 int session_usage_count;
664 int session_waiting_on_uc;
665 atomic_long_t cmd_pdus;
666 atomic_long_t rsp_pdus;
667 atomic_long_t tx_data_octets;
668 atomic_long_t rx_data_octets;
669 atomic_long_t conn_digest_errors;
670 atomic_long_t conn_timeout_errors;
671 u64 creation_time;
672 /* Number of active connections */
673 atomic_t nconn;
674 atomic_t session_continuation;
675 atomic_t session_fall_back_to_erl0;
676 atomic_t session_logout;
677 atomic_t session_reinstatement;
678 atomic_t session_stop_active;
679 atomic_t sleep_on_sess_wait_comp;
680 /* connection list */
681 struct list_head sess_conn_list;
682 struct list_head cr_active_list;
683 struct list_head cr_inactive_list;
684 spinlock_t conn_lock;
685 spinlock_t cr_a_lock;
686 spinlock_t cr_i_lock;
687 spinlock_t session_usage_lock;
688 spinlock_t ttt_lock;
689 struct completion async_msg_comp;
690 struct completion reinstatement_comp;
691 struct completion session_wait_comp;
692 struct completion session_waiting_on_uc_comp;
693 struct timer_list time2retain_timer;
694 struct iscsi_sess_ops *sess_ops;
695 struct se_session *se_sess;
696 struct iscsi_portal_group *tpg;
697} ____cacheline_aligned;
698
699struct iscsi_login {
700 u8 auth_complete;
701 u8 checked_for_existing;
702 u8 current_stage;
703 u8 leading_connection;
704 u8 first_request;
705 u8 version_min;
706 u8 version_max;
707 u8 login_complete;
708 u8 login_failed;
709 bool zero_tsih;
710 char isid[6];
711 u32 cmd_sn;
712 itt_t init_task_tag;
713 u32 initial_exp_statsn;
714 u32 rsp_length;
715 u16 cid;
716 u16 tsih;
717 char req[ISCSI_HDR_LEN];
718 char rsp[ISCSI_HDR_LEN];
719 char *req_buf;
720 char *rsp_buf;
721 struct iscsi_conn *conn;
722 struct iscsi_np *np;
723} ____cacheline_aligned;
724
725struct iscsi_node_attrib {
726 u32 dataout_timeout;
727 u32 dataout_timeout_retries;
728 u32 default_erl;
729 u32 nopin_timeout;
730 u32 nopin_response_timeout;
731 u32 random_datain_pdu_offsets;
732 u32 random_datain_seq_offsets;
733 u32 random_r2t_offsets;
734 u32 tmr_cold_reset;
735 u32 tmr_warm_reset;
736 struct iscsi_node_acl *nacl;
737};
738
739struct se_dev_entry_s;
740
741struct iscsi_node_auth {
742 enum naf_flags_table naf_flags;
743 int authenticate_target;
744 /* Used for iscsit_global->discovery_auth,
745 * set to zero (auth disabled) by default */
746 int enforce_discovery_auth;
747#define MAX_USER_LEN 256
748#define MAX_PASS_LEN 256
749 char userid[MAX_USER_LEN];
750 char password[MAX_PASS_LEN];
751 char userid_mutual[MAX_USER_LEN];
752 char password_mutual[MAX_PASS_LEN];
753};
754
755#include "iscsi_target_stat.h"
756
757struct iscsi_node_stat_grps {
758 struct config_group iscsi_sess_stats_group;
759 struct config_group iscsi_conn_stats_group;
760};
761
762struct iscsi_node_acl {
763 struct se_node_acl se_node_acl;
764 struct iscsi_node_attrib node_attrib;
765 struct iscsi_node_auth node_auth;
766 struct iscsi_node_stat_grps node_stat_grps;
767};
768
769struct iscsi_tpg_attrib {
770 u32 authentication;
771 u32 login_timeout;
772 u32 netif_timeout;
773 u32 generate_node_acls;
774 u32 cache_dynamic_acls;
775 u32 default_cmdsn_depth;
776 u32 demo_mode_write_protect;
777 u32 prod_mode_write_protect;
778 u32 demo_mode_discovery;
779 u32 default_erl;
780 u8 t10_pi;
781 u32 fabric_prot_type;
782 u32 tpg_enabled_sendtargets;
783 u32 login_keys_workaround;
784 struct iscsi_portal_group *tpg;
785};
786
787struct iscsi_np {
788 int np_network_transport;
789 int np_ip_proto;
790 int np_sock_type;
791 enum np_thread_state_table np_thread_state;
792 bool enabled;
793 atomic_t np_reset_count;
794 enum iscsi_timer_flags_table np_login_timer_flags;
795 u32 np_exports;
796 enum np_flags_table np_flags;
797 spinlock_t np_thread_lock;
798 struct completion np_restart_comp;
799 struct socket *np_socket;
800 struct sockaddr_storage np_sockaddr;
801 struct task_struct *np_thread;
802 struct timer_list np_login_timer;
803 void *np_context;
804 struct iscsit_transport *np_transport;
805 struct list_head np_list;
806} ____cacheline_aligned;
807
808struct iscsi_tpg_np {
809 struct iscsi_np *tpg_np;
810 struct iscsi_portal_group *tpg;
811 struct iscsi_tpg_np *tpg_np_parent;
812 struct list_head tpg_np_list;
813 struct list_head tpg_np_child_list;
814 struct list_head tpg_np_parent_list;
815 struct se_tpg_np se_tpg_np;
816 spinlock_t tpg_np_parent_lock;
817 struct completion tpg_np_comp;
818 struct kref tpg_np_kref;
819};
820
821struct iscsi_portal_group {
822 unsigned char tpg_chap_id;
823 /* TPG State */
824 enum tpg_state_table tpg_state;
825 /* Target Portal Group Tag */
826 u16 tpgt;
827 /* Id assigned to target sessions */
828 u16 ntsih;
829 /* Number of active sessions */
830 u32 nsessions;
831 /* Number of Network Portals available for this TPG */
832 u32 num_tpg_nps;
833 /* Per TPG LIO specific session ID. */
834 u32 sid;
835 /* Spinlock for adding/removing Network Portals */
836 spinlock_t tpg_np_lock;
837 spinlock_t tpg_state_lock;
838 struct se_portal_group tpg_se_tpg;
839 struct mutex tpg_access_lock;
840 struct semaphore np_login_sem;
841 struct iscsi_tpg_attrib tpg_attrib;
842 struct iscsi_node_auth tpg_demo_auth;
843 /* Pointer to default list of iSCSI parameters for TPG */
844 struct iscsi_param_list *param_list;
845 struct iscsi_tiqn *tpg_tiqn;
846 struct list_head tpg_gnp_list;
847 struct list_head tpg_list;
848} ____cacheline_aligned;
849
850struct iscsi_wwn_stat_grps {
851 struct config_group iscsi_stat_group;
852 struct config_group iscsi_instance_group;
853 struct config_group iscsi_sess_err_group;
854 struct config_group iscsi_tgt_attr_group;
855 struct config_group iscsi_login_stats_group;
856 struct config_group iscsi_logout_stats_group;
857};
858
859struct iscsi_tiqn {
860 unsigned char tiqn[ISCSI_IQN_LEN];
861 enum tiqn_state_table tiqn_state;
862 int tiqn_access_count;
863 u32 tiqn_active_tpgs;
864 u32 tiqn_ntpgs;
865 u32 tiqn_num_tpg_nps;
866 u32 tiqn_nsessions;
867 struct list_head tiqn_list;
868 struct list_head tiqn_tpg_list;
869 spinlock_t tiqn_state_lock;
870 spinlock_t tiqn_tpg_lock;
871 struct se_wwn tiqn_wwn;
872 struct iscsi_wwn_stat_grps tiqn_stat_grps;
873 int tiqn_index;
874 struct iscsi_sess_err_stats sess_err_stats;
875 struct iscsi_login_stats login_stats;
876 struct iscsi_logout_stats logout_stats;
877} ____cacheline_aligned;
878
879struct iscsit_global {
880 /* In core shutdown */
881 u32 in_shutdown;
882 u32 active_ts;
883 /* Unique identifier used for the authentication daemon */
884 u32 auth_id;
885 u32 inactive_ts;
886#define ISCSIT_BITMAP_BITS 262144
887 /* Thread Set bitmap pointer */
888 unsigned long *ts_bitmap;
889 spinlock_t ts_bitmap_lock;
890 /* Used for iSCSI discovery session authentication */
891 struct iscsi_node_acl discovery_acl;
892 struct iscsi_portal_group *discovery_tpg;
893};
894
895static inline u32 session_get_next_ttt(struct iscsi_session *session)
896{
897 u32 ttt;
898
899 spin_lock_bh(&session->ttt_lock);
900 ttt = session->targ_xfer_tag++;
901 if (ttt == 0xFFFFFFFF)
902 ttt = session->targ_xfer_tag++;
903 spin_unlock_bh(&session->ttt_lock);
904
905 return ttt;
906}
907
908extern struct iscsi_cmd *iscsit_find_cmd_from_itt(struct iscsi_conn *, itt_t);
909
910static inline void iscsit_thread_check_cpumask(
911 struct iscsi_conn *conn,
912 struct task_struct *p,
913 int mode)
914{
915 /*
916 * mode == 1 signals iscsi_target_tx_thread() usage.
917 * mode == 0 signals iscsi_target_rx_thread() usage.
918 */
919 if (mode == 1) {
920 if (!conn->conn_tx_reset_cpumask)
921 return;
922 conn->conn_tx_reset_cpumask = 0;
923 } else {
924 if (!conn->conn_rx_reset_cpumask)
925 return;
926 conn->conn_rx_reset_cpumask = 0;
927 }
928 /*
929 * Update the CPU mask for this single kthread so that
930 * both TX and RX kthreads are scheduled to run on the
931 * same CPU.
932 */
933 set_cpus_allowed_ptr(p, conn->conn_cpumask);
934}
935#endif /* ISCSI_TARGET_CORE_H */